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you also need to have it in the gfx/interface in icon_tradegoods.tga file.

Then in interface in the file mapitems.gfx (open it with notepad) you indicate the mapitems file, but you also need in assets.gfx to sort out which tradegoods are which (icon_tradegoods.tga), in the part

The number of frames indicate how you divide the picture (how many parts), so that if you divide it in 2, then the first part will be considered tradegood 1 and the second will be the icon for tradegood 2 (I think the order you specify in common/tradegoods is here important to sort it this way), so see how you can add the tradegood you want. Try it by trial and error (I don't remember if the original file has "slots", e.g. free space in the picture, so that we can simply change it without messing with its dimension). Do not forget to edit also the alpha channel.